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The loss of supporting fluid in a slurry shield during tunneling through soils with gravel and stones is a serious problem. Standard bentonite suspensions must be substituted by a special flocculated bentonite in addition to sand and coarse grained material with low density. This mixture can fill up the pores in the soil and the required support pressure may be reached. The tuning of the polymer flocculation agent with the bentonite, and an appropriate choice of the filling material, is essential. The use of bentonites with Cristoballite as an accessory mineral can reduce the amount of filling material needed.
Authors:Hermanns Stengele, Rita
Index Terms:ClayGroup; Hermanns Stengele, Rita